Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f0060b883d8210…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 07:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e0fb367dbe665eba3d8bb350ab0ffca SHA-1: ec9bda9f05ca1edefd6f117b9a8ce8448f66c7cb SHA-256: f3f0060b883d821001648a9ddb9c81ca66d65ea6c41db230b4e8f4489c0292cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a likely spearphishing attachment, aiming to exploit user trust to lead them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=sun+rise+this+morning
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1g01p97eaegcb38arbvmmi55nq/72814339860.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/14f8a625810951b8bbacefa63bd8ab10/witenezifukiwokikesogato.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3da161e7e---retonipep.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/3606c53a013f29e928c487a1c37c6e23/vuwumeferemikivaja.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d4cgo76tojj6g2ucojcj00nh1/8341879272.pdf
    • https://cabsfromheathrow.com/userfiles/file/xaxujonupoxavudujitor.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b988a9480ef---91089504525.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e494d4b4c---38146108491.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/750adfa004bc6c34faed2cad72aba1a3/91082313730.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6nekt1a31palidmqfkn5oeveq5/16976872362.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd13db1202e---seraxubatezuf.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/257b096e9ac35bcf438c37d58295f94d/96557462041.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/85f0c7b58fedb6c0bb15850b29941c27/64798554405.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaff1b3201---50047092180.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1mvb6s51j1o7esfjcdgqpdb72o/ruxagebamobirasufirumumu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9373adc8nn65r8k4l77oj1k57j/13229638121.pdf
    • http://alituncer.com/userfiles/file/60830119012.pdf
    • http://landia-print.com/pdir/file/notetolenesipelusi.pdf
    • http://www.contectrade.hu/fckfiles/file/41424193329.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/if1nsetjfpehl859jhls2ao9t1/7879051734.pdf
    • http://dansensvenner.dk/imagesfile///56016985861.pdf
    • https://akproauto.net/nbloom/fckuploads/file/joguxu.pdf
    • https://bbpartner.cz/userfiles/file/fazamalitakorepifi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16792 bytes
font_01_sfnt_off00010800.bin
0197154155b723a5ca8d9f9abb9b59245f9408d44d75c3dc6ee46507e5b56e1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10524 bytes
font_02_sfnt_off00011fc2.bin
57987e3c4d88693e5866a882f9f3515b4838c43eed8653ab9babb48b2b229346
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 17792 bytes